4k video from 1080 video

[Elusien]

The YouTube setting is rarely a good one to use. It increases filesize considerably over the default settings due to its small GOP size. See here for more info:

Different frame rate at different sections in one video

Yes the YouTube preset is definitely not good for this. The main cause of the large filesize is that it uses a GOP of 15 rather than 125, which the others use. This means that 1 frame in 15 will be an I-frame, rather than 1 in every 125. It also has only 2 B-frames between I- and P-frames. So for every 125 frames the YouTube preset will have about 8 times as many I-frames which only do spacial compressioin, not temporal compression, unlike the P- and B-frames. P-frames have most compression, so…